wendell goler is with the president on martha's vineyard tonight. >> reporter: egypt's most violent day since the ouster of hosni maubarak pulled the president out of vacation briefly and said the u.s. will boycott joint exercises that had been set next month. >> our traditional cooperation cannot continue as usual when civilians are being killed in the streets and rights are being rolled back. >> reporter: the biannual exercises began two years after the egypt-israel peace treaty and once a mainstay of the relationship and haven't been held since 2009 because of the continue i continuing instability. here on martha's vineyard, president obama has spent time on the phone with the national security team and briefed by the national security advisor but hasn't co hasn't -- talking about egypt's problems. >> reporter: they both have accused him of supporting the other side and so have his critics in this country. >> the president has put his thumb down on the scale on the side of the muslim brotherhood. this will resonate all over egypt and not do us any good. >> reporter: meanwhile, kentuc